<?php
function my_custom_dashboard_widgets()
{
global $wp_meta_boxes;
wp_add_dashboard_widget(
"custom_help_widget",
"TITLE OF THE WIDGET",
"custom_dashboard_help"
);
}
function custom_dashboard_help()
{
echo 'WRITE YOUR HTML IN HERE';
}
add_action("wp_dashboard_setup", "my_custom_dashboard_widgets");